Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Lithium based phosphates for use in lithium ion batteries and method of preparation

A lithium-ion battery, lithium-ion technology, applied in lithium storage batteries, battery electrodes, secondary batteries, etc., can solve the problem of low electricity of alkaline transition metal oxides, and achieve easy commercial production, low cost, and comparable electricity. Effect

Inactive Publication Date: 2001-12-12
VALENCE TECH INC
View PDF25 Cites 11 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, currently known and commonly employed basic transition metal oxides have low
Therefore, it is still difficult to obtain a lithium-containing chalcogenide electrode material that is qualified for use in batteries and does not have the disadvantage of a large amount of power loss.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Lithium based phosphates for use in lithium ion batteries and method of preparation
  • Lithium based phosphates for use in lithium ion batteries and method of preparation
  • Lithium based phosphates for use in lithium ion batteries and method of preparation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment I

[0060] The following describes the formation of Li 3 M’M” (PO 4 ) 3 Preferred steps for compounding active materials. Li 3 M’M” (PO 4 ) 3 The preparation method will use Li 3 V 2 (PO 4 ) 3 (Li 3 m 2 (PO 4 ) 3 ) formation to illustrate. The basic steps include making a lithium compound preferably lithium carbonate, a metal oxide preferably vanadium pentoxide and a phosphoric acid derivative preferably ammonium phosphate, ammonium phosphate NH 4 h 2 (PO 4 ) or (NH 4 ) 2 H(PO 4 ) to react. Each precursor material was purchased from a number of chemicals including Aldrich Chemical Company and Fluka. with approximately stoichiometric Li 2 co 3 , V 2 o 5 and (NH 4 )2 HPO 4 Preparation of Li from a mixture of 3 V 2 (PO 4 ) 3 . However, using a 5% excess of lithium (in the form of lithium carbonate) makes (Li 2 (O form) loss of lithium is minimized. The precursor materials were mixed carefully and then ground in a solution of methanol for about 30 minu...

Embodiment II

[0065] The Li prepared above was immediately tested in an electrochemical cell 3 V 2 (PO 4 ) 3 . A positive electrode was first prepared from this compound as described in the "Positive Electrode" section. The negative electrode is lithium metal. The electrolyte is a 2:1 weight ratio mixture of ethylene carbonate and dimethyl carbonate with 1 molar concentration of LiPF dissolved in it 6 . The battery cycles between about 3.0-4.3 volts and performs as figure 1 , 2 , 3, 4A and 4B.

[0066] figure 1 shows the voltage graph of the test cell, with the Li 3 M’M” (PO 4 ) 3 Based on the positive active material, a lithium metal counter electrode is used. figure 1 The data shown in are using the electrochemical voltage spectroscopy (EVS) technique. Electrochemical and kinetic data were recorded using the electrochemical voltage spectroscopy (EVS) technique. This technique is known in the art as described in J. Barker in Synth Met 28, D217 (1989), Synth Met 32, 43 (1969)...

Embodiment III

[0070] Embodiment III (hexagonal crystal Li 3 AlV(PO 4 ) 3 )

[0071] The following describes the preparation of Li 3 AlV(PO 4 ) 3 Methods. The basic steps include the reaction between lithium carbonate, aluminum hydroxide, vanadium oxide and ammonium phosphate according to the following equation:

[0072]

[0073] As described in Example 1, the precursor materials were first carefully ground and mixed. After mixing, the mixed powdered precursors were pressed into pellets, followed by heating at about 250° C. for about 6 hours under an argon atmosphere. The temperature was then increased to 600°C, also under argon, for 12 hours. Then, cool, grind and then granulate. Then, it was heated at a temperature of about 940° C. for about 15 hours under an argon atmosphere.

[0074] CuKα X-ray diffraction analysis was performed on the final product as described in Example 1. The unit cell parameters are shown in Table H.

[0075] Chemical analysis result and X-ray diagra...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The present invention provides an electrochemical cell using an electrode containing a phosphorus compound containing lithium metal.

Description

field of invention [0001] The present invention relates to improved materials useful as electrode active materials, methods for their manufacture, and electrodes made therefrom for use in electrochemical cells in batteries. background of the invention [0002] Lithium batteries are made from one or more lithium electrochemical cells containing electrochemically active materials. Such electrochemical cells generally include an anode (negative electrode), a cathode (positive electrode), and an electrolyte positioned between the positive and negative electrodes that are spaced apart. Batteries having a lithium metal anode and a cathode active material comprising a metal chalcogenide are known. The electrolyte typically comprises a lithium salt dissolved in one or more solvents, typically a non-aqueous (protic) organic solvent. Other electrolytes are solid electrolytes, generally called polymer matrices, containing an ionically conductive medium, usually metal powder or salt, ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): C01B25/30H01M4/136H01M4/1397H01M4/58H01M10/052H01M10/36
CPCH01M4/136H01M4/1397H01M4/5825H01M10/052Y02E60/10H01M4/1395H01M10/0525
Inventor J·巴克M·Y·赛义迪
Owner VALENCE TECH INC
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com